U.S. intelligence agencies intercepted an encrypted Iranian signal that federal officials believe could be linked to the activation of dormant operatives inside the United States, according to threat ...

As national security services warn that Russian hackers are currently engaged in new global attacks against WhatsApp and Signal users, here’s how to stay safe.

Dutch intelligence agencies have warned that Russia-linked hackers breached Signal and WhatsApp accounts belonging to government officials and journalists. The alert, directed at Western governments ...